Treadmill



FIG. 1 is a front perspective view of the treadmill according to the invention;

FIG. 2 is a side view of the treadmill shown in FIG. 1, the other side being a mirror image thereof;

FIG. 3 is a top plan view thereof; and,

FIG. 4 is a rear view thereof. 

The ornamental design for a treadmill, as shown and described. 